51660615086853 has 4 divisors (see below), whose sum is σ = 68880820115808. Its totient is φ = 34440410057900.

The previous prime is 51660615086849. The next prime is 51660615086887. The reversal of 51660615086853 is 35868051606615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51660615086853 - 2² = 51660615086849 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51660615086053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8610102514473 + ... + 8610102514478.

It is an arithmetic number, because the mean of its divisors is an integer number (17220205028952).

Almost surely, 2^{51660615086853} is an apocalyptic number.

It is an amenable number.

51660615086853 is a deficient number, since it is larger than the sum of its proper divisors (17220205028955).

51660615086853 is a wasteful number, since it uses less digits than its factorization.

51660615086853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17220205028954.

The product of its (nonzero) digits is 31104000, while the sum is 60.

The spelling of 51660615086853 in words is "fifty-one trillion, six hundred sixty billion, six hundred fifteen million, eighty-six thousand, eight hundred fifty-three".